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I have a UIImage with white background. I would like replace the white background/pixels with alpha-transparent pixels. I’ve looked at other questions on StackOverflow, along with Quartz documentation, but have yet to find a coherent “start-to-end” for this problem. How is this done?
A UIImage wraps a CGImage. Take the CGImage, run it through CGImageCreateWithMaskingColors, then either create a new UIImage from the result or assign the result back to the UIImage.